The quarterback(m=150kg)is scrambling at 7.6 m/s when he releases the football (m=400 g). The quarterback slows to 2.3 m/s after throwing the ball. What is the velocity of the football?

An uplifted block of rock between two normal faults

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?